PHP Fatal error: Uncaught Error: Class “WPGMZA\\Page” not found in

wp-google-maps 9.0.22
wp-google-maps-pro 8.1.20
PHP fatal error

PHP Fatal error:  Uncaught Error: Class "WPGMZA\\Page" not found in
 /srv/the_site/WebSite/htdocs/wp-content/plugins/wp-google-maps/includes/class.installer-page.php:5
Stack trace:
#0 /srv/the_site/WebSite/htdocs/wp-content/plugins/wp-google-maps-pro/legacy-core.php(15): require_once()
#1 /srv/the_site/WebSite/htdocs/wp-content/plugins/wp-google-maps/includes/class.plugin.php(13): wpgmza_require_once()
#2 /srv/the_site/WebSite/htdocs/wp-content/plugins/wp-google-maps-pro/legacy-core.php(15): require_once('...')
#3 /srv/the_site/WebSite/htdocs/wp-content/plugins/wp-google-maps/legacy-core.php(27): wpgmza_require_once()
#4 /srv/the_site/WebSite/htdocs/wp-content/plugins/wp-google-maps/wpGoogleMaps.php(689): require_once('...')
#5 /srv/the_site/WebSite/htdocs/wp-settings.php(462): include_once('...')
#6 /srv/the_site/WebSite/htdocs/wp-config.php(91): require_once('...')
#7 /srv/the_site/WebSite/htdocs/wp-load.php(50): require_once('...')
#8 /srv/the_site/WebSite/htdocs/wp-blog-header.php(13): require_once('...')
#9 /srv/the_site/WebSite/htdocs/index.php(17): require('...')
#10 {main}
  thrown in /srv/the_site/WebSite/htdocs/wp-content/plugins/wp-google-maps/includes/class.installer-page.php on line 5

The Class “WPGMZA\\Page” does not appear to be defined in either plugin.

This error began when we updated the site a few days ago. All plugins and WordPress are at the current versions.

It is referenced here:
./includes/class.page.php:add_action(‘wp_ajax_wpgmza_hide_chat’, array(‘WPGMZA\\Page‘, ‘hideChat’)); (line 108)

When we comment out line 108 in file includes/class.page.php , the web site becomes available.

When line 108 is present, neither the web site, nor the /wp-admin are available, both cases produce the stack trace posted above.

Cheers!